/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/NiagaraEditorSettings.h
Sets a delegate that allows external code to restrict which features can be used within the niagara editor by filtering which classes are allowed.
void SetOnIsClassAllowed ( const [FOnIsClassAllowed](API\Plugins\NiagaraEditor\UNiagaraEditorSettings\FOnIsClassAllowed) & InOnIsClassAllowed )